Method Name:
os.getppid
Method Signature:
os.getppid()
Parameters:
None
Method Overview:
- The getppid() method of the Python os module returns the pid i.e.,the process id, of the parent process.
- A parent process is a process, which has created a child process.
Example 1:
|
import os
print("Parent process Id of this running Python program:") print(os.getppid()) |
Output:
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Parent process Id of this running Python program: 1118 |
Running the below commands from the terminal corroborates the above output
$echo $$
$1118
$ps -p 1118 -o comm
$COMM
-bash
Both the outputs above confirm the process id 1118 is the pid of the –bash shell which ran the python program.
Example 2:
|
import os
# Print the parent of this program's process print("Parent process Id of this running Python program:") shell = os.getppid() print(os.getppid())
print("From child process:My process id is:%d"%(os.getpid()))
# Create a child process retVal = os.fork()
if retVal is 0: print("From grandchild process:") print("From grandchild process:My process id is:%d"%(os.getpid())) print("From grandchild process:Parent id of this child is/was:%d"%(os.getppid())) print("From grandchild process:My grandparent is/was %d:"%(shell)) print("Child process exiting")
else: for index in range(1, 10): print("Parent process printing value:%d"%(index)) print("Parent process exiting") |
Output:
|
Parent process Id of this running Python program: 1118 From child process:My process id is:3420 Parent process printing value:1 Parent process printing value:2 Parent process printing value:3 Parent process printing value:4 Parent process printing value:5 Parent process printing value:6 Parent process printing value:7 Parent process printing value:8 Parent process printing value:9 Parent process exiting From grand child process: From grand child process:My process id is:3421 From grand child process:Parent id of this child is/was:3420 From grand child process:My grand parent is/was 1118: Child process exiting |